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Using the generic type 'System.Collections.Generic.List<T>' requires '1' type arguments

Posted on 2009-04-06
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Last Modified: 2013-12-17
I have used code to merge cells in gridview but it shows error


 Using the generic type 'System.Collections.Generic.List<T>' requires '1' type arguments


so can you help your suggest anything for the same???????
public static List<T> MakeList_tmp<T>(T temp)
        {
            List<T> newList = new List<T>();
            return newList;
        }
 
 
 
        private void mergeRows(GridView gv)
        {
            string lastColumn1 = string.Empty;
            
            GridViewRow currentRow = null;
            GridViewRow tmp = null;
            var temp = tmp;
            var tempRow = MakeList_tmp(temp);
            System.Collections.Generic.List tempRows = new System.Collections.Generic.List();
            
            foreach (GridViewRow row in gv.Rows)
            {
                if (row.RowType == DataControlRowType.DataRow)
                {
                    string currentColumn1 = string.Empty;
                    currentColumn1 = Convert.ToString(row.Cells[0].Text);
 
                    if (currentRow == null)
                    {
 
                        currentRow = row;
                        lastColumn1 = Convert.ToString(row.Cells[0].Text);
 
                    }
 
 
                    else
                    {
                        if (lastColumn1 != currentColumn1)
                        {
 
                            currentRow.Cells[0].RowSpan = tempRows.Count + 1;
                            currentRow.Cells[0].VerticalAlign = VerticalAlign.Middle;
                            currentRow.Cells[0].HorizontalAlign = HorizontalAlign.Center;
 
                            foreach (GridViewRow row1 in tempRows)
 
                                row1.Cells.RemoveAt(1);
                            lastColumn1 = currentColumn1;
 
                            tempRows.Clear();
                            currentRow = row;
                            lastColumn1 = currentColumn1;
                        }
                        else
                        {
 
                            tempRows.Add(row);
                        }
                    }
                }
            }
           
            if (tempRows.Count >= 0)
            {
                
                currentRow.Cells[0].RowSpan = tempRows.Count + 1;
                currentRow.Cells[0].VerticalAlign = VerticalAlign.Middle;
                currentRow.Cells[0].HorizontalAlign = HorizontalAlign.Center;
 
                foreach (GridViewRow row1 in tempRows)
                    row1.Cells.RemoveAt(0);
            }
        }
protected void GridView1_PreRender(object sender, EventArgs e)
        {
            GridView gv1 = (GridView)sender;
            mergeRows(gv1);
 
        }

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Question by:scspl
  • 4
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7 Comments
 
LVL 142

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 24074963
what about this:
public static List<T> MakeList_tmp<T>()   // if you need and argument, it shall by <T> temp and not T temp, AFAIK
        {
            List<T> newList = new List<T>();
            return newList;
        }
 
and later: 

     private void mergeRows(GridView gv)
        {
            string lastColumn1 = string.Empty;
            
            GridViewRow currentRow = null;
            GridViewRow tmp = null;
            List<GridViewRow> tempRows = MakeList_tmp();
            ...

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Author Comment

by:scspl
ID: 24074994
So, if here

GridViewRow tmp = null;

List<GridViewRow> tempRows = MakeList_tmp();


i want to pass tmp with MakeList_tmp(tmp) so

how it should be written over here and how the argument will be passed to

the MakeList_temp() <----    function....
0
 
LVL 142

Assisted Solution

by:Guy Hengel [angelIII / a3]
Guy Hengel [angelIII / a3] earned 500 total points
ID: 24075019
as I explained in the comment of the previous comment:
public static List<T> MakeList_tmp<T>(<T> tmp)  

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Author Comment

by:scspl
ID: 24075094
it is not accepting that...

<T> tmp -->  is not a valid argument.....

so is there any other way...
public static List<T> MakeList_tmp<T>(<T> tmp)   
{
    List<T> newList = new List<T>();
    return newList;
}
 
 
 
 
// Above code generates the error:->
 
// Compiler Error Message: CS1031: Type expected

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LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24075111
sorry, in the method parameter data type, it's without the <>
public static List<T> MakeList_tmp<T>(T tmp)   
{
    List<T> newList = new List<T>();
    return newList;
}
 

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Author Comment

by:scspl
ID: 24075126
That matter is solved but tell me one thing

where will  the method  mergeRows() called?

will it be before databinding or after that???
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Author Comment

by:scspl
ID: 24075141
now i got it it's working thanks a lot for your help


it will be called after binding the data to the data grid

other wise it will show the null reference error.

because it will not have any data into cells without binding..



thank you

again angel
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